Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec9c7f49834ba10…

MALICIOUS

PDF

89.1 KB Created: 2021-08-18 19:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7fce0535076a56695ef5ac51c3e4f18 SHA-1: 148d48f9a986eb15eaf59cb6a342b30066639040 SHA-256: aec9c7f49834ba100a26bf1e4b787ab451346dda9ea82ffcaa783cbe2df83890
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'download' button lure reinforces this, suggesting the PDF is designed to trick users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850a7bd2fbc---33980205951.pdf In PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/32ljl6kdu80ik212uucsh2enaa/94213575203.pdfIn PDF document text
    • https://educhina.mn/editor/files/giwijobuviju.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fae87d1a78---93207976074.pdfIn PDF document text
    • http://yanartextil.com/firma/files/9053905823.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb02a09438---70974750366.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/ketakuzizosifapim.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/67d62a1c2315b7475276999fcd6a66d3/kufajuguwesekemoripa.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607589963ff73---18536153356.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0af166ea29987f986b3adb68a4e2b0d3/13186903644.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5b90e919c6467f6a5b5a9b9b4e380459/dizuzoxab.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/logogalavanir.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/zuladoten.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161003c6c8dc1f---vuremori.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/52702981519.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/038f58177baf8110dfd1b5976178ae4c/wurifopuxod.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/07eb1d82dda27a876746aa94e22504e5/karilefazabuv.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/nupekeforaparatife.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zogilatemamemowotonosaji.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108eaac6df7f---mipezomakitajoxeru.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/696ffd07285a70dd14beff20844fd8b7/78471123230.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/67664763882.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998e348e638---givikebatudajulopovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+java+edition+1.14+apk+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 11008 bytes
SHA-256: 67f11d2a9d0021cf8615a798898d3e9fcd512288f6e087f4d548bfb3f37b5cd8
font_01_sfnt_off00010fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB7 17184 bytes
SHA-256: 771938ef8b66a07b9fb3adf648d9a7d2a013bd4971c26c9a45c7793ece6187b7
font_02_sfnt_off00013d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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